naa a22 4500 510818579 CHVBK 20180411083519.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1007/s12306-013-0248-1 doi (NATIONALLICENCE)springer-10.1007/s12306-013-0248-1 Effect of brightness in the evaluation of lumbar pedicular screws position: clinical study [Elektronische Daten] [LM. Romero-Muñoz, M. Alfonso, C. Villas, J. Zubieta] Artifact may lead to confusion when evaluating postoperative CT scans of lumbar pedicle screws. The aim of our study was to develop a specific metal artifact reduction image protocol, in order to reduce metal artifact caused by titanium pedicular screw in patients undergoing lumbar pathology by lumbar fusion. Therefore, the reduction in metal artifacts in lumbar pedicle screws allows surgeons to do an accurate diagnosis of the exact placement of inserted pedicle screws, minimizes false reexploration, and maximizes proper and prompt treatment of misplaced screw. In a first step, we performed a retrospective study of 103 titanium alloy pedicle screws in patients undergoing a lumbar instrumented fusion for treatment for degenerative disease. CT scan was performed postoperatively evaluating the possible overdimension caused by artifact. In a second step, a prospective study was performed using a 64-slice multidetector-row computed tomography (MDCT) in 104 titanium alloy pedicle screws in patients undergoing a lumbar instrumented fusion for treatment for degenerative disease. Our results show that on the group of sequential CT scan, mean overdimension (on each side) due to brightness was 1.045mm (SD 0.45). On the group of 64-slice multichannel CT, mean overdimension (on each side) due to brightness was 0.005mm at the proximal part of the screw and 0.025mm at the distal part of the screw. The results observed suggest that beam-hardening artifacts caused by the screw on CT after lumbar fusion are dramatically reduced by using specific metal artifact reduction image protocol in a 64-slice MDCT. Istituti Ortopedici Rizzoli, 2013 Pedicle nationallicence Screw nationallicence Lumbar spine nationallicence CT nationallicence Artifact nationallicence Romero-Muñoz LM Department of Orthopedics, University Clinic of Navarra, Avenida de Pio XII, 36, 31008, Pamplona, Navarra, Spain aut Alfonso M. Department of Orthopedics, University Clinic of Navarra, Avenida de Pio XII, 36, 31008, Pamplona, Navarra, Spain aut Villas C. Department of Orthopedics, University Clinic of Navarra, Avenida de Pio XII, 36, 31008, Pamplona, Navarra, Spain aut Zubieta J. Department of Radiology, University Clinic of Navarra, Pamplona, Spain aut MUSCULOSKELETAL SURGERY Springer Milan 97/2(2013-08-01), 159-164 2035-5106 97:2<159 2013 97 12306 https://doi.org/10.1007/s12306-013-0248-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12306-013-0248-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Romero-Muñoz LM Department of Orthopedics, University Clinic of Navarra, Avenida de Pio XII, 36, 31008, Pamplona, Navarra, Spain aut NATIONALLICENCE 700 1- Alfonso M. Department of Orthopedics, University Clinic of Navarra, Avenida de Pio XII, 36, 31008, Pamplona, Navarra, Spain aut NATIONALLICENCE 700 1- Villas C. Department of Orthopedics, University Clinic of Navarra, Avenida de Pio XII, 36, 31008, Pamplona, Navarra, Spain aut NATIONALLICENCE 700 1- Zubieta J. Department of Radiology, University Clinic of Navarra, Pamplona, Spain aut NATIONALLICENCE 773 0- MUSCULOSKELETAL SURGERY Springer Milan 97/2(2013-08-01), 159-164 2035-5106 97:2<159 2013 97 12306 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer